Malicious PDF — malware analysis report

Static analysis result for SHA-256 8768de9864af94cc…

MALICIOUS

PDF

67.1 KB Created: 2021-09-18 21:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70222273bb79e1b880b72cc0d891a4f2 SHA-1: 67f335b8de2347470791abdcd4d7c31daf5b2b5e SHA-256: 8768de9864af94cc4f2e630432c64b3ef2561cefb25a28b237add011c620c0fc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=youtube+download+site+android PDF link annotation
    • https://arabadvertise.com/userfiles/files/dubex.pdfIn PDF document text
    • http://unityproductions.com/upload/files/21631194803.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161413e9f46656---pajaniguvikewosijapov.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/naxamapeletupijadadamaxef.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/55663408674.pdfIn PDF document text
    • http://ombs.ru/uploads/files/71480560679.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/julifozof.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/21489782693.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/gaxafugo.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/15154899775.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109121150341462.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/kawirufufadasalufiwepozow.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ddd25b70b2cf43aaed8727fa55e9d36a/sasunezaxu.pdfIn PDF document text
    • http://evola.it/userfiles/files/vepesi.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/zomonin.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/zadebatetonezewedijojeg.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/gegimewerexoraro.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/nekigidebode.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/91639582423.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/88474666764.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/gipavatoxoj.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39D 14140 bytes
SHA-256: f0eb79388236690e1a6bb275154867de1fe8f8b1d4b448a6f87185c2943247ad
font_02_sfnt_off0000e6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E6 10552 bytes
SHA-256: 2baa82d5b571253adacdfb12bf5aa32f783e2df457fe6144dfe0ff77c6cb9287

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